Cryptic crossword No 3,869

Across

1. One responder per shift is to allow regular breaks (4)
2. Ventral responder in source (5)
3. See 26d (4)
4. Looking within describes the type of practice we aim for (4)
5. Wounded sister needs trip to get wound treatment (5-5)
6. Sounds like foreign doctors are in the patrons' house? (6)
7. Salad wrapping? (8)
8. Medication complicates cephalic traumas (15)
9. Bungling SM poisoner fails quality needed as doctor! (15)
10. Organism read from file? (4,4)
11. Swapping right for left avoids headlines and gives measured solutions (6)
12. Give publicity to small model and move the others (10)
13. Walk unsteadily and look back (4)
14. In fifty percent it's found as O ! (4)
15. Hides PPE! (5)
16. To be the boss is a raw deal (4)

Down

1. Swapping in fruit or vegetable for support provides layered power for Basic Life Support ? (3)
2. Three approaches to percussive instrumentation? (9)
3. When half a second is a second? (3)
4. Hastily insert one malfunctioning LED in a rush (9)
5. Solutions for dying? (9)
6. Charge and nourish endlessly (3)
7. Fashionable friends injured deliberately for the relative freedom of a hospital bed? (7)
8. Location of tennis elbow occuring during late rally (7)
9. Sedative as initial treatment of overactive patient in ultra-marathon (5)
10. Indeed, emaciation can disguise swollen tissue (5)
11. Hyperthermia treatment in frozen cathedral city (3)
12. Bariatric regularly not been seen (5)
13. Proud falsifier is, statistically speaking, not mainstream (7)
14. Celebrations are part of the package when the safest IV meets Advanced Life Support (9)
15. Drove crazily and unit equipment delivered late (7)
16. Double the week's intensive care equipment initially (5)